0.51 Dyneema Composite Fabric vapor barrier socks
0.3oz for the pair. These are very basic, but work very well. Can be worn under a sock or in place of socks. They are intended to be baggy since DCF does not stretch. The material is thin enough that they don't feel bulky when bunched up. Totally impermeable fabric that is very strong. Won't blow out like the ol' bread bags.